Hello, I recently installed 24" super chuncks in the corners of my room. It made an awesome difference. So far, they only go up 4". I would like to extend them to the ceiling. My wife has asked me to make these a bit smaller so the room doesn't feel "closed in." Would 16" super chuncks still be a help in bass absorption? 12"? At what point do they become useless? Thanks for the help.